Added example, further plugin work

plugins/README.txt

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+### Note
+Copy the example and rename it to your desired name. The Main class and passed in arguments are required. You don't necessarily need to use the passed in socket_id or event_system.

plugins/example/__main__.py

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+# Python imports
+import sys, traceback, threading, inspect, os, time
+
+# Gtk imports
+import gi
+gi.require_version('Gtk', '3.0')
+from gi.repository import Gtk
+
+# Application imports
+
+
+def threaded(fn):
+    def wrapper(*args, **kwargs):
+        threading.Thread(target=fn, args=args, kwargs=kwargs, daemon=True).start()
+    return wrapper
+
+
+class Main:
+    def __init__(self, socket_id, event_system):
+        self._socket_id    = socket_id
+        self._event_system = event_system
+        self._gtk_plug     = Gtk.Plug.new(self._socket_id)
+        self.start_loop()
+
+    @threaded
+    def start_loop(self):
+        i      = 0
+        cycles = 5
+        alive  = True
+        while alive:
+            if i == cycles:
+                alive = False
+
+            self._event_system.push_gui_event(["some_type", "display_message", ("warning", str(i), None)])
+            i += 1
+
+            time.sleep(1)